有加速校园网

import threading
import requests

def download_file(url, start_byte, end_byte, filename):
    headers = {'Range': f'bytes={start_byte}-{end_byte}'}
    response = requests.get(url, headers=headers, stream=True)
    with open(filename, 'rb+') as f:
        f.seek(start_byte)
        for chunk in response.iter_content(chunk_size=8192):
            if chunk:
                f.write(chunk)

def multi_thread_download(url, num_threads=4):
    response = requests.head(url)
    file_size = int(response.headers['content-length'])
    threads = []
    part_size = file_size // num_threads
    
    with open('file_to_download', 'wb') as f:
        f.truncate(file_size)
    
    for i in range(num_threads):
        start = i * part_size
        end = start + part_size - 1 if i < num_threads - 1 else file_size - 1
        t = threading.Thread(target=download_file, args=(url, start, end, 'file_to_download'))
        threads.append(t)
        t.start()
    
    for t in threads:
        t.join()

# 使用示例
multi_thread_download('http://example.com/file_to_download')